After Lecture 7 and Lecture 8, I have learnt the definition of Social Network Analysis and the terminology. Also, the formulas for calculating different types of centrality.
Before lecture 9, I do not have any idea in what application can make use of social network analysis. It is not much information about SNA application on the internet. I only know that the Sociogram can illustrate the relationship between every people in a social network and we can use a matrix to represent the Sociogram and calculate the centrality of the social network.
After Lecture 9, I have learnt the calculation about Prestige. Also, I have learnt some applications about SNA, which are PageRank and HITS.
I have installed the PageRank plugin for my Chrome web browser, It shows the PageRank status of a website.
http://pagerank.chromefans.org/pagerank-checker/
The below description is quote from above website:
"PageRank (PR) is a link analysis algorithm used by the Google search engine. It's a numeric value (0-10) that represents how important a page is on the web."
I have checked Facebook, CUHK, Google and Yahoo HK's PageRank:
Facebook and Google's PageRank are 9
While CUHK's PageRank is 7
Yahoo HK's PageRank is 3. It is funny to see Yahoo HK's PageRank is lower than most of the websites which I often visit. (Because of Yahoo = Google's competitor ??? I don't think so. To me, I can get the best search result from Google rather than Yahoo. I rarely visit Yahoo in these years. So I think it is possible for Yahoo to have such low PageRank)
When I visit Wikipedia about PageRank, I found that there is an hyperlink about another interesting algorithm, which the algorithm is EigenTrust:
http://en.wikipedia.org/wiki/EigenTrust
The below text is quote from the above website:
"EigenTrust algorithm is a reputation management algorithm for peer-to-peer networks, developed by Sep Kamvar, Mario Schlosser, and Hector Garcia-Molina. The algorithm provides each peer in the network a unique global trust value based on the peer's history of uploads and thus aims to reduce the number of inauthentic files in a P2P network."
The idea is similar to the algorithms which I've learnt in the lectures.
the way to mathematics pagerank is realy funny and do have something with the frequency people check it.
回覆刪除Yahoo HK's PageRank is only 3？ That is interesting.eh...I want use this tool but find it only shows a blank page. So, shall I install the PageRank plugin mentioned in your article? I just want to figer out the PageRank of baidu. :D
回覆刪除Yes, it is funny. :D but it seems only available for Chrome only.
刪除Interesting finding. Does it mean nobody cares Yahoo now?
回覆刪除I think the users of the same website must share a lot of common points, and by collecting data from their users those Internet companies may find more efficient ways to provide better service for them. However, the abuse of SNA may also lead to infringement on user's privacy. In my opinion there is still a long way before SNA being applied and trusted by most of people.
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